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Proceedings Paper

Radiographic tomography using near-monochromatic gamma rays
Author(s): Eric C. Schreiber; Patrick G. O'Shea
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Paper Abstract

We describe a new radiographic technique using quasi- monochromatic (gamma) -rays. Conventional radiography of dense or thick objects is severely limited by the broad energy spread of bremsstrahlung (gamma) -rays. The development of intense, tunable, near-monochromatic (gamma) - rays sources in the 4-30 MeV range affords the opportunity to develop a new type of radiographic tomography. Such (gamma) -rays will shortly be available from inverse Compton free-electron laser sources. The expected narrow energy spread and energy tunability will allow not only the structure and distribution of material in an object to be determined but also the specific elemental composition of the material. This is because each element has a slightly different absorption cross section minimum. Furthermore, the quasi-monochromatic nature of the incident (gamma) -ray beam will allow discrimination between scattered and unscattered photons exiting the test object, and result in reliable composition and density data. In this paper, we present an overview of the radiographic process and some early computer simulation results.

Paper Details

Date Published: 1 November 1997
PDF: 9 pages
Proc. SPIE 3154, Coherent Electron-Beam X-Ray Sources: Techniques and Applications, (1 November 1997); doi: 10.1117/12.293365
Show Author Affiliations
Eric C. Schreiber, Triangle Universities Nuclear Lab. (United States)
Patrick G. O'Shea, Duke Univ. (United States)


Published in SPIE Proceedings Vol. 3154:
Coherent Electron-Beam X-Ray Sources: Techniques and Applications
Andreas K. Freund; Henry P. Freund; Malcolm R. Howells, Editor(s)

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